X0306 4 2021-02-08 false 0001503274 Quanterix Corp QTRX 0001252546 HRUSOVSKY E KEVIN C/O QUANTERIX CORPORATION, 900 MIDDLESEX TURNPIKE BILLERICA MA 01821 true true false false Chairman, President & CEO Common Stock 2021-02-08 4 A false 18397.00 0.00 A 1015936.00 D Common Stock 2021-02-09 4 S false 700.00 76.8077 D 1015236.00 D Common Stock 2021-02-09 4 S false 3100.00 78.2426 D 1012136.00 D Common Stock 2021-02-09 4 S false 1200.00 78.8079 D 1010936.00 D Stock Option (right to buy) 77.79 2021-02-08 4 A false 42925.00 0.00 A 2031-02-08 Common Stock 42925.00 42925.00 D Represents shares of stock issuable on vesting of restricted stock units. The restricted stock units vest as to 25% of the shares on February 8, 2022, and the remaining 75% vest in 36 equal monthly installments at the end of each month beginning on February 28, 2022. Includes 146,668 restricted stock units and 39,815 shares of common stock that are subject to performance based vesting. The sale of shares was effected pursuant to a Rule 10b5-1 trading plan adopted on December 14, 2020. This transaction was executed in multiple trades at prices ranging from $76.53 to $77.30. The price reported reflects the weighted average sale price. The reporting person undertakes to provide upon request to the SEC staff, the issuer or any security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. This transaction was executed in multiple trades at prices ranging from $77.57 to $78.55. The price reported reflects the weighted average sale price. The reporting person undertakes to provide upon request to the SEC staff, the issuer or any security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. This transaction was executed in multiple trades at prices ranging from $78.64 to $79.16. The price reported reflects the weighted average sale price. The reporting person undertakes to provide upon request to the SEC staff, the issuer or any security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. The option vests as to 25% of the shares on February 8, 2022, and the remaining 75% vests in 36 equal monthly installments at the end of each month beginning on February 28, 2022. /s/ Brian Keane, as Attorney-in-Fact 2021-02-10